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[Qemu-devel] [PATCH] cadence_uart: check for serial backend before using
From: |
fred . konrad |
Subject: |
[Qemu-devel] [PATCH] cadence_uart: check for serial backend before using it. |
Date: |
Tue, 15 Jul 2014 17:18:44 +0200 |
From: KONRAD Frederic <address@hidden>
This checks that s->chr is not NULL before using it.
Signed-off-by: KONRAD Frederic <address@hidden>
---
hw/char/cadence_uart.c | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/hw/char/cadence_uart.c b/hw/char/cadence_uart.c
index dbbc167..a5736cb 100644
--- a/hw/char/cadence_uart.c
+++ b/hw/char/cadence_uart.c
@@ -175,8 +175,10 @@ static void uart_send_breaks(UartState *s)
{
int break_enabled = 1;
- qemu_chr_fe_ioctl(s->chr, CHR_IOCTL_SERIAL_SET_BREAK,
- &break_enabled);
+ if (s->chr) {
+ qemu_chr_fe_ioctl(s->chr, CHR_IOCTL_SERIAL_SET_BREAK,
+ &break_enabled);
+ }
}
static void uart_parameters_setup(UartState *s)
@@ -227,7 +229,9 @@ static void uart_parameters_setup(UartState *s)
packet_size += ssp.data_bits + ssp.stop_bits;
s->char_tx_time = (get_ticks_per_sec() / ssp.speed) * packet_size;
- qemu_chr_fe_ioctl(s->chr, CHR_IOCTL_SERIAL_SET_PARAMS, &ssp);
+ if (s->chr) {
+ qemu_chr_fe_ioctl(s->chr, CHR_IOCTL_SERIAL_SET_PARAMS, &ssp);
+ }
}
static int uart_can_receive(void *opaque)
@@ -295,6 +299,7 @@ static gboolean cadence_uart_xmit(GIOChannel *chan,
GIOCondition cond,
/* instant drain the fifo when there's no back-end */
if (!s->chr) {
s->tx_count = 0;
+ return FALSE;
}
if (!s->tx_count) {
@@ -375,7 +380,9 @@ static void uart_read_rx_fifo(UartState *s, uint32_t *c)
*c = s->rx_fifo[rx_rpos];
s->rx_count--;
- qemu_chr_accept_input(s->chr);
+ if (s->chr) {
+ qemu_chr_accept_input(s->chr);
+ }
} else {
*c = 0;
}
--
1.9.0
- [Qemu-devel] [PATCH] cadence_uart: check for serial backend before using it.,
fred . konrad <=